5.2.9 IDs and fragment identifiers
It is not only possible to link to a document, but also to a specific location in a document. The element to which you want to link (a header, image, ...) must have an ID assigned. To do this, place the cursor inside the element to which to assign the ID, and then press the "Edit ID" button on the toolbar.
Then to link to the specific element, just insert a link like you always do. Both the "Create link" and "Create link by searching" dialogs allow to select the ID from the target document (in the "fragment ID" field). In the HTML source, the target ID is specified in the link as in this example:
This link will cause the browser to scroll to the element with an ID attribute with the value "notes". The part starting from the hash sign is called the "fragment identifier".
Explicit anchor elements (e.g. HTML <a name="notes"/>) are not supported, as these sort of elements are not visible in the wysiwyg editor and thus users would work blindly if these were used (deleting or moving them without being aware of it, and being impossible to edit in wysiwyg mode).